The unit of measurement of property rights for the valuables held by a
Guarantor is a WebMoney title unit of the relevant type.

System participants can open purses with any Guarantor by accepting the
relevant Agreement. For user convenience, all of the purses of a user are kept
in a single storage (Keeper) which is assigned with a user registration number,
WMID. The description of how a WMID operates together with the Terms of Use are
outlined in the Agreement on Property Rights Transfer accepted by a user upon
signing up with the System.